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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.

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/*
 * Copyright (c) 2006-2011 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.startup;

import java.io.*;
import java.lang.management.*;
import java.util.*;

import com.sun.tools.attach.*;
import com.sun.tools.attach.spi.*;
import sun.tools.attach.*;

final class JDK6AgentLoader
{
   private static final AttachProvider ATTACH_PROVIDER = new AttachProvider()
   {
      @Override
      public String name() { return null; }

      @Override
      public String type() { return null; }

      @Override
      public VirtualMachine attachVirtualMachine(String id) { return null; }

      @Override
      public List listVirtualMachines() { return null; }
   };

   private final String jarFilePath;
   private final String pid;

   JDK6AgentLoader(String jarFilePath)
   {
      this.jarFilePath = jarFilePath;
      pid = discoverProcessIdForRunningVM();
   }

   private String discoverProcessIdForRunningVM()
   {
      String nameOfRunningVM = ManagementFactory.getRuntimeMXBean().getName();
      int p = nameOfRunningVM.indexOf('@');

      return nameOfRunningVM.substring(0, p);
   }

   void loadAgent()
   {
      VirtualMachine vm;

      if (AttachProvider.providers().isEmpty()) {
         vm = getVirtualMachineImplementationFromEmbeddedOnes();
      }
      else {
         vm = attachToThisVM();
      }

      loadAgentAndDetachFromThisVM(vm);
   }

   @SuppressWarnings({"UseOfSunClasses"})
   private VirtualMachine getVirtualMachineImplementationFromEmbeddedOnes()
   {
      try {
         if (File.separatorChar == '\\') {
            return new WindowsVirtualMachine(ATTACH_PROVIDER, pid);
         }
         else {
            return new LinuxVirtualMachine(ATTACH_PROVIDER, pid);
         }
      }
      catch (AttachNotSupportedException e) {
         throw new RuntimeException(e);
      }
      catch (IOException e) {
         throw new RuntimeException(e);
      }
      catch (UnsatisfiedLinkError e) {
         throw new IllegalStateException("Native library for Attach API not available in this JRE", e);
      }
   }

   private VirtualMachine attachToThisVM()
   {
      try {
         return VirtualMachine.attach(pid);
      }
      catch (AttachNotSupportedException e) {
         throw new RuntimeException(e);
      }
      catch (IOException e) {
         throw new RuntimeException(e);
      }
   }

   private void loadAgentAndDetachFromThisVM(VirtualMachine vm)
   {
      try {
         vm.loadAgent(jarFilePath, null);
         vm.detach();
      }
      catch (AgentLoadException e) {
         throw new RuntimeException(e);
      }
      catch (AgentInitializationException e) {
         throw new RuntimeException(e);
      }
      catch (IOException e) {
         throw new RuntimeException(e);
      }
   }
}